/* Oxton LMS — minimal, profissional, sem sombras, sem animações */
*,*::before,*::after{box-sizing:border-box}
:root{
  --primary:#1a1a1a;--accent:#2563eb;--accent-hover:#1d4ed8;
  --text:#111;--muted:#6b7280;--subtle:#9ca3af;
  --border:#e5e7eb;--border-strong:#d1d5db;
  --bg:#fff;--bg-soft:#fafafa;--bg-muted:#f5f5f5;
  --success:#15803d;--warning:#b45309;--danger:#b91c1c;
  --radius:4px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
}
html{font-size:15px}
html,body{margin:0;padding:0;font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
iframe,video,table,pre{max-width:100%}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.3;font-weight:600;color:var(--text);letter-spacing:-.01em}
h1{font-size:1.625rem}h2{font-size:1.25rem}h3{font-size:1.05rem}h4{font-size:.95rem}
p{margin:0 0 1em}
code{font-family:ui-monospace,"SF Mono",Menlo,monospace;font-size:.88em;background:var(--bg-muted);padding:1px 5px;border-radius:3px}

.container{max-width:1180px;margin:0 auto;padding:0 24px}
.row{display:flex;flex-wrap:wrap;gap:20px}
.col{flex:1}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.site-header .container{display:flex;align-items:center;gap:32px;padding-top:12px;padding-bottom:12px}
.logo{font-size:1.05rem;font-weight:700;color:var(--text);letter-spacing:-.02em}
.logo:hover{text-decoration:none}
.logo span{color:var(--muted);font-weight:500}
.nav{display:flex;gap:24px;flex:1}
.nav a{color:var(--text);font-weight:500;font-size:.92rem}
.nav a:hover{color:var(--accent);text-decoration:none}
.header-search{flex:1;max-width:340px}
.header-search input{width:100%;padding:7px 12px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;font-size:.9rem}
.header-actions{display:flex;gap:8px;align-items:center}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;background:var(--text);color:#fff;border:1px solid var(--text);border-radius:var(--radius);font-weight:500;cursor:pointer;font-size:.88rem;text-decoration:none;line-height:1.2;font-family:inherit}
.btn:hover{background:#000;color:#fff;text-decoration:none}
.btn-outline{background:#fff;color:var(--text);border:1px solid var(--border-strong)}
.btn-outline:hover{background:var(--bg-soft);color:var(--text)}
.btn-primary{background:var(--accent);border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid transparent;padding:6px 12px}
.btn-ghost:hover{background:var(--bg-muted);text-decoration:none}
.btn-sm{padding:5px 11px;font-size:.82rem}
.btn-danger{background:var(--danger);border-color:var(--danger)}
.btn-danger:hover{background:#991b1b;border-color:#991b1b}
.btn-success{background:var(--success);border-color:var(--success)}
.btn-success:hover{background:#166534;border-color:#166534}
.btn-block{display:flex;width:100%}

/* Cards */
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px}

/* Course grid */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.course-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.course-card .thumb{aspect-ratio:16/10;background:var(--bg-muted);position:relative;overflow:hidden;border-bottom:1px solid var(--border)}
.course-card .thumb img{width:100%;height:100%;object-fit:cover}
.course-card .badge{position:absolute;top:10px;left:10px;background:#fff;color:var(--text);padding:3px 8px;border-radius:3px;font-size:.7rem;font-weight:500;border:1px solid var(--border)}
.course-card .body{padding:14px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.course-card .cat{font-size:.72rem;color:var(--muted);font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.course-card h3{font-size:.98rem;margin:0;line-height:1.35}
.course-card .meta{display:flex;gap:14px;font-size:.8rem;color:var(--muted);margin-top:auto;padding-top:6px}
.course-card .instructor{font-size:.82rem;color:var(--muted)}
.course-card .footer{padding:10px 16px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;background:var(--bg-soft)}
.price{font-weight:600;color:var(--text);font-size:.95rem}
.price.free{color:var(--success)}
.rating{color:var(--text);font-weight:500;font-size:.82rem}

/* Hero — simples, sem gradiente */
.hero{background:var(--bg-soft);border-bottom:1px solid var(--border);padding:72px 0 64px;margin-bottom:48px}
.hero h1{font-size:2.25rem;margin-bottom:.3em;letter-spacing:-.02em}
.hero p{font-size:1.05rem;color:var(--muted);max-width:600px;margin-bottom:1.6em}
.hero-stats{display:flex;gap:48px;margin-top:40px;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column;gap:2px}
.hero-stat .num{font-size:1.5rem;font-weight:600;letter-spacing:-.02em}
.hero-stat .label{color:var(--muted);font-size:.82rem}

.section{margin:48px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:20px;border-bottom:1px solid var(--border);padding-bottom:12px}
.section-head h2{margin:0}
.section-head .lead{color:var(--muted);margin:4px 0 0;font-size:.88rem}

/* Categories */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.cat-tile{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px 16px;text-decoration:none;color:var(--text)}
.cat-tile:hover{border-color:var(--border-strong);text-decoration:none;background:var(--bg-soft)}
.cat-tile .icon{font-size:1.4rem;margin-bottom:6px;opacity:.85}
.cat-tile strong{font-size:.9rem;font-weight:600}
.cat-tile .count{font-size:.78rem;color:var(--muted);margin-top:2px}

/* Forms */
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:500;margin-bottom:5px;font-size:.85rem;color:var(--text)}
.form-control,input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],textarea,select{
  width:100%;padding:8px 12px;border:1px solid var(--border-strong);border-radius:var(--radius);font-size:.9rem;font-family:inherit;background:#fff;color:var(--text);line-height:1.4
}
.form-control:focus,input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
textarea{min-height:100px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-help{color:var(--muted);font-size:.8rem;margin-top:3px}
.auth-box{max-width:400px;margin:60px auto;padding:32px;background:#fff;border:1px solid var(--border);border-radius:var(--radius)}
.auth-box h1{font-size:1.4rem;text-align:center;margin-bottom:24px}

/* Alerts */
.alert{padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:18px;font-size:.88rem}
.alert-success{background:#f0fdf4;color:var(--success);border-color:#bbf7d0}
.alert-error{background:#fef2f2;color:var(--danger);border-color:#fecaca}
.alert-info{background:#eff6ff;color:#1e40af;border-color:#bfdbfe}

/* Tables */
.table{width:100%;background:#fff;border:1px solid var(--border);border-radius:var(--radius);border-collapse:separate;border-spacing:0;overflow:hidden}
.table th,.table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--border);font-size:.88rem;vertical-align:middle}
.table th{background:var(--bg-soft);font-weight:500;font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.table tr:last-child td{border-bottom:none}
.table tr:hover td{background:var(--bg-soft)}

.badge-pill{display:inline-block;padding:2px 8px;border-radius:3px;font-size:.72rem;font-weight:500;border:1px solid var(--border-strong);background:#fff;color:var(--text)}
.badge-publish{background:#f0fdf4;color:var(--success);border-color:#bbf7d0}
.badge-draft{background:#fffbeb;color:var(--warning);border-color:#fde68a}
.badge-private{background:#f3f4f6;color:var(--muted)}
.badge-admin{background:#fef2f2;color:var(--danger);border-color:#fecaca}
.badge-instructor{background:#eff6ff;color:#1e40af;border-color:#bfdbfe}
.badge-student{background:#f3f4f6;color:var(--muted)}

/* Sidebar */
.dash{display:grid;grid-template-columns:220px 1fr;gap:32px;margin:32px 0}
.dash-side{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:12px;align-self:start;position:sticky;top:72px}
.dash-side a{display:block;padding:7px 12px;border-radius:var(--radius);color:var(--text);font-weight:400;font-size:.88rem;margin-bottom:1px}
.dash-side a:hover{background:var(--bg-soft);text-decoration:none}
.dash-side a.active{background:var(--bg-muted);font-weight:500;color:var(--text)}
.dash-side .head{font-size:.7rem;text-transform:uppercase;color:var(--subtle);letter-spacing:.06em;margin:12px 0 6px;padding-left:12px;font-weight:600}

/* Stat */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin-bottom:28px}
.stat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px}
.stat .label{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px;font-weight:500}
.stat .value{font-size:1.5rem;font-weight:600;letter-spacing:-.01em}

/* Avatar */
.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:99px;color:#fff;font-weight:600;text-transform:uppercase;font-size:.78rem}

/* Course single */
.course-hero{background:var(--bg-soft);border-bottom:1px solid var(--border);padding:40px 0}
.course-hero h1{font-size:1.75rem;margin-bottom:8px}
.course-hero .breadcrumb{font-size:.82rem;color:var(--muted);margin-bottom:10px}
.course-hero .breadcrumb a{color:var(--muted)}
.course-hero .meta{display:flex;gap:20px;flex-wrap:wrap;font-size:.85rem;color:var(--muted);margin-top:14px}
.course-layout{display:grid;grid-template-columns:1fr 340px;gap:32px;margin:28px 0}
.course-layout .sidebar{position:sticky;top:72px;align-self:start}
.course-buy{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.course-buy .thumb{aspect-ratio:16/10;background:var(--bg-muted);border-bottom:1px solid var(--border)}
.course-buy .body{padding:20px}
.course-buy .price-big{font-size:1.625rem;font-weight:600;color:var(--text);margin-bottom:14px;letter-spacing:-.01em}
.course-buy ul.feats{list-style:none;padding:0;margin:16px 0 0;font-size:.85rem;color:var(--muted)}
.course-buy ul.feats li{padding:6px 0;border-bottom:1px solid var(--border)}
.course-buy ul.feats li:last-child{border-bottom:none}

.curriculum-section{background:#fff;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.curriculum-section .head{padding:12px 16px;background:var(--bg-soft);border-bottom:1px solid var(--border);font-weight:500;font-size:.92rem}
.curriculum-section .lesson{padding:10px 16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;color:var(--text);font-size:.88rem}
.curriculum-section .lesson:last-child{border-bottom:none}
.curriculum-section .lesson .left{display:flex;gap:10px;align-items:center}
.curriculum-section .lesson .icon{color:var(--muted);font-size:.85rem}

/* Learn view */
.learn-wrap{display:grid;grid-template-columns:1fr 300px;gap:0;min-height:calc(100vh - 56px)}
.learn-main{padding:28px;overflow:auto;background:#fff}
.learn-side{background:var(--bg-soft);border-left:1px solid var(--border);overflow:auto}
.learn-side .head{padding:14px 16px;border-bottom:1px solid var(--border);font-weight:500;font-size:.88rem;background:#fff}
.learn-side .section-title{padding:10px 16px;background:#fff;font-weight:500;font-size:.82rem;color:var(--muted);border-top:1px solid var(--border);text-transform:uppercase;letter-spacing:.04em}
.learn-side .lesson-item{padding:9px 16px;display:flex;gap:10px;align-items:center;border-top:1px solid var(--border);color:var(--text);font-size:.85rem}
.learn-side .lesson-item:hover{background:#fff;text-decoration:none}
.learn-side .lesson-item.active{background:#fff;font-weight:500;border-left:2px solid var(--accent);padding-left:14px}
.learn-side .lesson-item.done .check{color:var(--success)}
.learn-side .lesson-item .check{color:var(--subtle);font-size:.85rem}
.video-frame{aspect-ratio:16/9;background:#000;border-radius:var(--radius);overflow:hidden;margin-bottom:20px;border:1px solid var(--border)}
.video-frame iframe,.video-frame video{width:100%;height:100%;border:0}

.progress-bar{height:4px;background:var(--bg-muted);border-radius:2px;overflow:hidden}
.progress-bar > div{height:100%;background:var(--accent)}

/* Quiz */
.quiz-question{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin-bottom:14px}
.quiz-question .q-num{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}
.quiz-question h3{margin:0 0 12px}
.quiz-option{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:6px;cursor:pointer;font-size:.9rem}
.quiz-option:hover{background:var(--bg-soft)}
.quiz-option input{margin-top:3px}
.quiz-option.correct{background:#f0fdf4;border-color:#bbf7d0}
.quiz-option.wrong{background:#fef2f2;border-color:#fecaca}
.quiz-option.selected{border-color:var(--accent);background:#eff6ff}
.quiz-result-banner{padding:20px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:20px;text-align:center}
.quiz-result-banner.passed{background:#f0fdf4;border-color:#bbf7d0}
.quiz-result-banner.failed{background:#fef2f2;border-color:#fecaca}
.quiz-result-banner .score{font-size:2rem;font-weight:600;letter-spacing:-.02em;margin:6px 0}

/* ============================================================
   COURSE DETAIL PAGE — sidebar sticky + tabs (estilo MasterStudy)
============================================================ */
.course-page{background:#fff;min-height:100vh;padding-bottom:40px}
.course-page .container{max-width:1240px}
.course-crumb{padding:20px 0 14px;font-size:.8rem;color:#9b9ba8}
.course-crumb a{color:#9b9ba8}
.course-crumb a:hover{color:#0a0a0a}

.course-layout{display:grid;grid-template-columns:1fr 380px;gap:36px;align-items:start}

/* ===== Sidebar sticky ===== */
.course-sidebar{order:2;position:sticky;top:80px;align-self:start}
.course-buy-card{
  background:#fff;border:1px solid #e8e8ec;border-radius:10px;overflow:hidden;
}
.course-buy-thumb{aspect-ratio:16/10;background:#f5f5f7;position:relative;overflow:hidden}
.course-buy-thumb img,.course-buy-thumb iframe{width:100%;height:100%;object-fit:cover;border:0;display:block}
.course-buy-thumb .thumb-placeholder{font-size:3rem;text-align:center;padding-top:50px;color:#c7c7d1}
.play-overlay{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:8px;
  background:rgba(10,10,10,.32);color:#fff;font-weight:600;font-size:.92rem;
}
.play-overlay span{
  background:#fff;color:#0a0a0a;width:46px;height:46px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;font-size:.85rem;padding-left:3px;
}
.play-overlay:hover{text-decoration:none;color:#fff;background:rgba(10,10,10,.45)}

.course-buy-body{padding:18px 20px}
.course-price-row{display:flex;align-items:baseline;gap:10px;margin-bottom:14px}
.course-price{font-size:1.85rem;font-weight:700;color:#0a0a0a;letter-spacing:-.02em}
.course-price.free{color:#10b981}
.course-price-old{color:#9b9ba8;font-size:.95rem;text-decoration:line-through}
.course-discount{background:#fef2f2;color:#dc2626;font-weight:600;font-size:.74rem;padding:3px 8px;border-radius:99px}

.course-buy-card .btn-primary{background:#6366f1;border-color:#6366f1}
.course-buy-card .btn-primary:hover{background:#4f46e5;border-color:#4f46e5}

.course-buy-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px;padding-top:14px;border-top:1px solid #f0f0f3}
.course-action{
  background:#fff;border:1px solid #e0e0e6;border-radius:6px;padding:8px 10px;
  cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;
  font-size:.82rem;font-weight:500;color:#0a0a0a;font-family:inherit;
}
.course-action .ic{color:#9b9ba8;font-size:1rem}
.course-action:hover{border-color:#c7c7d1}
.course-action.on{background:#fef2f2;border-color:#fecaca;color:#dc2626}
.course-action.on .ic{color:#dc2626}

.course-feats{list-style:none;padding:14px 0 0;margin:14px 0 0;font-size:.85rem;border-top:1px solid #f0f0f3}
.course-feats li{padding:7px 0;color:#6b6b78;display:flex;align-items:center;gap:10px}
.course-feats li strong{color:#0a0a0a;font-weight:600}
.course-feats .fi{
  display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;
  border-radius:6px;background:#f5f5f7;font-size:.8rem;flex-shrink:0;
}

/* ===== Main ===== */
.course-main{order:1;min-width:0}
.course-top-row{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.course-cat-chip{
  background:#eef2ff;color:#4f46e5;font-size:.74rem;font-weight:600;padding:4px 11px;
  border-radius:99px;text-transform:uppercase;letter-spacing:.04em;text-decoration:none;
}
.course-cat-chip:hover{background:#6366f1;color:#fff;text-decoration:none}
.course-level-chip{
  background:#f0fdf4;color:#15803d;font-size:.74rem;font-weight:600;padding:4px 11px;
  border-radius:99px;text-transform:uppercase;letter-spacing:.04em;
}
.course-level-chip.intermediate{background:#fef3c7;color:#92400e}
.course-level-chip.advanced{background:#fef2f2;color:#b91c1c}
.course-status-chip{background:#f5f5f7;color:#6b6b78;font-size:.74rem;font-weight:600;padding:4px 11px;border-radius:99px;text-transform:uppercase;letter-spacing:.04em}

.course-title{font-size:2.1rem;margin:6px 0 12px;line-height:1.2;letter-spacing:-.02em;font-weight:700;color:#0a0a0a}
.course-excerpt{font-size:1.05rem;color:#404048;line-height:1.55;margin-bottom:20px}

.course-info-row{display:flex;gap:24px;flex-wrap:wrap;padding:14px 0;border-top:1px solid #f0f0f3;border-bottom:1px solid #f0f0f3;margin-bottom:20px}
.course-info-block{display:flex;align-items:center;gap:10px;font-size:.86rem}
.course-info-block .ic{font-size:1rem}
.course-info-block small{display:block;color:#9b9ba8;font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;font-weight:600}
.course-info-block strong,.course-info-block .instr-name{display:block;color:#0a0a0a;font-weight:600;font-size:.92rem}
.course-info-block .instr-name:hover{color:#6366f1;text-decoration:none}

/* ===== Tabs ===== */
.course-tabs{
  display:flex;gap:0;border-bottom:1px solid #e8e8ec;margin-bottom:24px;
  position:sticky;top:56px;background:#fff;z-index:10;overflow-x:auto;
}
.ct-tab{
  background:transparent;border:none;padding:12px 18px;cursor:pointer;font-size:.92rem;
  color:#6b6b78;font-weight:500;border-bottom:2px solid transparent;font-family:inherit;
  white-space:nowrap;display:inline-flex;align-items:center;gap:6px;
}
.ct-tab:hover{color:#0a0a0a}
.ct-tab.active{color:#6366f1;border-bottom-color:#6366f1;font-weight:600}
.ct-tab .pill{background:#f5f5f7;color:#6b6b78;font-size:.7rem;padding:1px 7px;border-radius:99px;font-weight:600}
.ct-tab.active .pill{background:#eef2ff;color:#6366f1}

.ct-pane{display:none}
.ct-pane.active{display:block;animation:fade .15s ease-out}
@keyframes fade{from{opacity:.4}to{opacity:1}}
.ct-block{margin-bottom:30px}
.ct-block h2{font-size:1.25rem;font-weight:700;letter-spacing:-.01em;margin-bottom:14px}
.prose{color:#404048;line-height:1.65;font-size:.95rem}

.learn-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:8px 24px}
.learn-list li{padding:7px 0;font-size:.92rem;color:#404048;display:flex;gap:10px;align-items:flex-start}
.learn-list .check{color:#10b981;font-weight:700;flex-shrink:0;margin-top:2px}

.bullet-list{list-style:none;padding:0;margin:0}
.bullet-list li{padding:6px 0 6px 22px;position:relative;font-size:.92rem;color:#404048}
.bullet-list li::before{content:'•';position:absolute;left:6px;color:#6366f1;font-weight:700}

/* Curriculum ====== */
.curri-overview{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:14px;flex-wrap:wrap;gap:8px}
.curri-overview h2{margin:0}
.curri-summary{color:#6b6b78;font-size:.88rem}
.public-section{
  background:#fff;border:1px solid #e8e8ec;border-radius:8px;margin-bottom:8px;overflow:hidden;
}
.public-section summary{
  padding:14px 18px;cursor:pointer;list-style:none;background:#fafafa;
  display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;
}
.public-section summary::-webkit-details-marker{display:none}
.public-section summary::before{
  content:'+';color:#6b6b78;font-weight:700;width:18px;display:inline-block;
  font-family:'SF Mono',ui-monospace,monospace;
}
.public-section[open] summary::before{content:'−'}
.public-section .ps-title{flex:1;margin-left:8px;color:#0a0a0a}
.public-section .ps-meta{color:#9b9ba8;font-size:.78rem;font-weight:500}
.ps-lessons{list-style:none;margin:0;padding:0}
.ps-lesson{padding:11px 18px;border-top:1px solid #f0f0f3;display:flex;align-items:center;gap:10px;font-size:.88rem}
.ps-lesson .ps-ico{
  width:24px;height:24px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;
  font-size:.75rem;font-weight:700;flex-shrink:0;font-family:'SF Mono',ui-monospace,monospace;
}
.ps-lesson.is-video .ps-ico{background:#e0f2fe;color:#0284c7}
.ps-lesson.is-text .ps-ico{background:#d1fae5;color:#047857}
.ps-lesson.is-quiz .ps-ico{background:#ede9fe;color:#7c3aed}
.ps-name{flex:1;color:#0a0a0a;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ps-preview{background:#fef3c7;color:#b45309;font-size:.7rem;padding:2px 7px;border-radius:99px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.ps-dur{color:#9b9ba8;font-size:.78rem;font-variant-numeric:tabular-nums}

/* Instructor card */
.instructor-card{display:flex;gap:18px;align-items:flex-start;padding:18px;background:#fafafa;border:1px solid #e8e8ec;border-radius:10px}
.instructor-card h3{margin:0;font-size:1.05rem}
.coinstructors-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.coinstructor-card{display:flex;gap:12px;align-items:center;padding:12px 14px;border:1px solid #e8e8ec;border-radius:8px;background:#fff}

/* Reviews */
.reviews-summary{display:flex;align-items:center;gap:24px;padding:18px;background:#fafafa;border:1px solid #e8e8ec;border-radius:10px;margin-bottom:16px}
.rs-num{font-size:2.4rem;font-weight:700;letter-spacing:-.02em;line-height:1}
.rs-stars{font-size:1.05rem;letter-spacing:2px}
.rs-count{display:block;color:#6b6b78;font-size:.85rem;margin-top:2px}
.review{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid #f0f0f3}
.review:last-child{border-bottom:none}
.rating-mini{font-size:.86rem;letter-spacing:1px;margin-left:6px}

/* FAQ */
.public-faq{background:#fff;border:1px solid #e8e8ec;border-radius:8px;padding:14px 18px;margin-bottom:8px}
.public-faq summary{cursor:pointer;font-weight:600;font-size:.95rem;list-style:none;display:flex;align-items:center;gap:10px}
.public-faq summary::-webkit-details-marker{display:none}
.public-faq summary::before{content:'+';color:#6366f1;font-weight:700;width:14px;font-family:'SF Mono',ui-monospace,monospace}
.public-faq[open] summary::before{content:'−'}
.public-faq p{margin:10px 0 0 24px;color:#404048;font-size:.92rem;line-height:1.6}

/* Announcements */
.announcement{padding:14px 18px;background:#eef2ff;border:1px solid #c7d2fe;border-radius:8px;margin-bottom:8px;border-left:3px solid #6366f1}
.announcement header{display:flex;justify-content:space-between;margin-bottom:6px}
.announcement strong{color:#0a0a0a;font-size:.95rem}
.announcement small{color:#6b6b78;font-size:.78rem}
.announcement p{margin:0;color:#404048;font-size:.9rem;line-height:1.55}

/* Related */
.related-section{margin-top:48px;padding-top:32px;border-top:1px solid #e8e8ec}
.related-title{font-size:1.25rem;font-weight:700;letter-spacing:-.01em;margin-bottom:18px}

@media(max-width:900px){
  .course-layout{grid-template-columns:1fr}
  .course-sidebar{position:static;order:1;margin-bottom:20px}
  .course-main{order:2}
  .course-title{font-size:1.6rem}
  .course-tabs{top:54px}
}

/* Footer */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:32px 0;margin-top:60px;color:var(--muted);font-size:.85rem}
.site-footer a{color:var(--muted)}
.site-footer .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px}
.site-footer .logo{color:var(--text)}
.site-footer strong{color:var(--text);font-weight:500;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;display:block;margin-bottom:8px}
.site-footer .col-links a{display:block;padding:2px 0}

/* Utilities */
.text-center{text-align:center}
.text-muted{color:var(--muted)}
.text-sm{font-size:.85rem}
.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:32px}
.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.mb-4{margin-bottom:32px}
.flex{display:flex}.flex-between{display:flex;justify-content:space-between;align-items:center}
.gap-1{gap:8px}.gap-2{gap:16px}.gap-3{gap:24px}
.tag{display:inline-block;padding:2px 8px;background:var(--bg-muted);color:var(--muted);border-radius:3px;font-size:.72rem;font-weight:500;border:1px solid var(--border)}
.empty{padding:48px 24px;text-align:center;color:var(--muted);background:#fff;border:1px dashed var(--border-strong);border-radius:var(--radius)}

@media(max-width:900px){
  .dash{grid-template-columns:1fr}
  .dash-side{position:static}
  .course-layout{grid-template-columns:1fr}
  .learn-wrap{grid-template-columns:1fr;min-height:auto}
  .form-row{grid-template-columns:1fr}
  .hero h1{font-size:1.75rem}
  .site-header .container{flex-wrap:wrap;gap:12px}
  .nav{order:3;width:100%}
}